Undo operation keeps resetting my settings
Yep, known problem:
https://developer.blender.org/T71759

Sculpt/Vertex/Weight Paint Brush Size Gets Undone After Undoing a
Stroke
Short description of error
After changing the size, then doing a
strike and immediately undoing it, the brush size gets undone as well.
Steps to reproduce

Splash Screen &gt; Sculpting or File &gt; New &gt; Sculpting.
Change the size of the brush ]
Sculpt: Only one stroke.
Undo